| Competition: | Serie B-C North |
| Season: | 1945–46 |
| Winners: | Alessandria 1st title |
| Prevseason: | 1942–43 B ← 1942–43 C |
| Nextseason: | 1946–47 |
This special Serie B-C championship was organized with geographical criteria with Serie B and the best Serie C teams from Northern Italy taking part. For this reason, it is not included in the statistics even if it was an official tournament.
Just after the Allied disbandment of the fascist Higher Directory, the major clubs from US-occupied Northern Italy replaced it by a provisional football league, the High Italy League (Lega Alta Italia), which organized the expanded local section of the Serie B.
Spezia asked to be admitted to Serie A. After the refusal of FIGC, Spezia decided to join the regional leagues.Ultimately, Spezia was admitted to Serie B in the following season.
Northern Italy had 12 Serie B clubs: six regular and three re-admitted teams of the last pre-war season, and three clubs promoted from Serie C. However, newly-promoted Varese obtained a yearly break for huge wartime damages, while Spezia Calcio did not join.
All Serie C guests advancing to the final round were granted a titular Serie B licence.
Three groups were created: Western, Central and Eastern.
On 16 May 1946 the Lega Calcio was created. Under agreements between FIGC, Northern and Southern clubs, all clubs from this championship out of the last ones were admitted to the Northern Serie B.